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media: atomisp: detect the PMIC type

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Sub-device's power management can be provided via different ways.

Instead of hardcoding it, add a code that would be detecting it.

This uses a code similar to what's found at the atomisp driver
inside the Intel Aero repository:

	https://github.com/intel-aero/meta-intel-aero.git

(driver was removed on some commit, but it can be found on
git history).

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Mauro Carvalho Chehab
2020-05-10 22:04:37 +02:00
parent a79afb97e0
commit 93e24ec6bf
1 changed files with 64 additions and 10 deletions
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74
drivers/staging/media/atomisp/platform/intel-mid/atomisp_gmin_platform.c
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@@ -17,7 +17,6 @@
#define MAX_SUBDEVS 8
enum clock_rate {
VLV2_CLK_XTAL_25_0MHz = 0,
VLV2_CLK_PLL_19P2MHZ = 1
@@ -57,6 +56,11 @@ struct gmin_subdev {
static struct gmin_subdev gmin_subdevs[MAX_SUBDEVS];
/* ACPI HIDs for the PMICs that could be used by this driver */
#define PMIC_ACPI_AXP "INT33F4:00" /* XPower AXP288 PMIC */
#define PMIC_ACPI_TI "INT33F5:00" /* Dollar Cove TI PMIC */
#define PMIC_ACPI_CRYSTALCOVE "INT33FD:00" /* Crystal Cove PMIC */
static enum {
PMIC_UNSET = 0,
PMIC_REGULATOR,
@@ -67,13 +71,12 @@ static enum {
static const char *pmic_name[] = {
[PMIC_UNSET] = "unset",
[PMIC_REGULATOR] = "regulator",
[PMIC_AXP] = "AXP",
[PMIC_TI] = "TI",
[PMIC_CRYSTALCOVE] = "Crystal Cove",
[PMIC_REGULATOR] = "regulator driver",
[PMIC_AXP] = "XPower AXP288 PMIC",
[PMIC_TI] = "Dollar Cove TI PMIC",
[PMIC_CRYSTALCOVE] = "Crystal Cove PMIC",
};
/* The atomisp uses type==0 for the end-of-list marker, so leave space. */
static struct intel_v4l2_subdev_table pdata_subdevs[MAX_SUBDEVS + 1];
@@ -355,27 +358,78 @@ static const struct dmi_system_id gmin_vars[] = {
#define GMIN_PMC_CLK_NAME 14 /* "pmc_plt_clk_[0..5]" */
static char gmin_pmc_clk_name[GMIN_PMC_CLK_NAME];
struct gmin_match_name {
const char *name;
struct device *dev;
};
static int gmin_match_one(struct device *dev, void *data)
{
struct gmin_match_name *match = data;
const char *name = match->name;
struct i2c_client *client;
if (dev->type != &i2c_client_type)
return 0;
client = to_i2c_client(dev);
dev_info(match->dev, "found '%s' at address 0x%02x, adapter %d\n",
client->name, client->addr, client->adapter->nr);
return (!strcmp(name, client->name));
}
static bool gmin_i2c_dev_exists(struct device *dev, char *name)
{
struct gmin_match_name match;
bool found;
int ret = 0;
match.dev = dev;
match.name = name;
ret = i2c_for_each_dev(&match, gmin_match_one);
found = !!ret;
if (found)
dev_info(dev, "%s found on I2C\n", name);
else
dev_info(dev, "%s not found on I2C\n", name);
return found;
}
static struct gmin_subdev *gmin_subdev_add(struct v4l2_subdev *subdev)
{
int i, ret;
struct device *dev;
struct i2c_client *client = v4l2_get_subdevdata(subdev);
if (!pmic_id)
pmic_id = PMIC_REGULATOR;
if (!client)
return NULL;
dev = &client->dev;
if (!pmic_id) {
if (gmin_i2c_dev_exists(dev, PMIC_ACPI_TI))
pmic_id = PMIC_TI;
else if (gmin_i2c_dev_exists(dev, PMIC_ACPI_AXP))
pmic_id = PMIC_AXP;
else if (gmin_i2c_dev_exists(dev, PMIC_ACPI_CRYSTALCOVE))
pmic_id = PMIC_CRYSTALCOVE;
else
pmic_id = PMIC_REGULATOR;
}
for (i = 0; i < MAX_SUBDEVS && gmin_subdevs[i].subdev; i++)
;
if (i >= MAX_SUBDEVS)
return NULL;
dev_info(dev,
"gmin: initializing atomisp module subdev data using PMIC %s\n",
"gmin: power management provided via %s\n",
pmic_name[pmic_id]);
gmin_subdevs[i].subdev = subdev;